Share-Based Compensation - Schedule of Share Based Compensation Stock Options Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Stock Options, Shares:
Outstanding Beginning Shares	2,063
Forfeited or Expired Shares	(209)
Outstanding Ending Shares	1,854	2,063
Shares Exercisable	1,776
Weighted Average Exercise Price:
Outstanding Beginning Weighted Average Exercise Price	$ 23.03
Forfeited or Expired Weighted Average Exercise Price	22.39
Outstanding Ending Weighted Average Exercise Price	23.10	$ 23.03
Exercisable Weighted Average Exercise Price	$ 22.86
Weighted Average Remaining Contractual Term:
Outstanding Weighted Average Remaining Contractual Term	3 years 9 months 18 days	3 years 10 months 24 days
Exercisable Weighted Average Remaining Contractual Term	3 years 8 months 12 days
Aggregate Intrinsic Value :
Outstanding Aggregate Intrinsic Value	$ 1,015	$ 4,111
Exercisable Aggregate Intrinsic Value	$ 1,014